Experiences with MacPartsDepot or other stores?

My 45w charger for my 2014 MacBook Air shredded (longest a charger has ever lasted me). In googling chargers, I’ve found a couple sites that sell what appear to be authentic chargers for far below the $79 retail. MacPartsDepot.com is one, and macsales.com is another.

Has anyone had experiences with these stores, or is my best bet just going to Best Buy?